Etienne boileau



E. BOILEAU. Fire Plate for Stoves.

Patented July 1869.

' plate ilntrd mes 'airatdtjiiiw.

Leners-Patent N .92,253, dated .my c, 1869.

FIRE- PLATES FOR STOVES.

. The Schedule vreferred to in these Letters 'Patent and making part otthe same.

Toall whom it may concern Be it knownthat I, ETIENNE BOILEAU, of thecity and county of St. Louis, andState ot' Missouri, have inventedcertain new and nsct'ul Improvements in Fire-Plates for Stoves; and dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawing, making a part of this specification, in which- Figure l is afront .elevation of my improved lire- Figure 2 is a rear elevation ofthe same; and Figures 3 and 4 are horizontal and vertical sections,

respectively, on the lines x a: and y y of tig. 1.

Letters ot' like name and kind Yrefer to like parts in each of thefigures. A l l In the use ot' cast-iron back-plates for the -tireboxesof stoves for burning c'oal, muehclitleulty has been experienced ininsuring either stability or durability, as the intense heat, heiligapplied to 4but one side only of said plate, would in a. very short timewarp it out of I shape, and render it useless; or it still retained inthe stove, said heat would fburn out,'and destroy the plate, renderingit necessary that the same should he frequently renewed, at aconsiderable expense.

l 'lo obviate these objections, and furnish a sutcient supply ot' air tothe hiel-chamber, above the fuel, to

consume the gas, is the object of my invention; which consistsinconstrncting said-back-plates of a seriesofr 'vertical triangularbars, joined together at their upper and lower. ends, and soproportioned as that the base ot said triangle, which is placed nextv tothe fire, shallbe equal .to only one-third ot the area of its sine,

by which means the action of the cool air at the rear ot' said bars o'rplate, entirely countcracts that of the `fire in front, and not onlyprevents warping of said plate, but also prevents overheating.

1t further consists in the employment of the V-shaped grooves, betweenthe bars upon the rear ot' said plate, forfthe passage of air to theupper edge thereof, from whence it escapes into the fuel-chamber throughsnitahle openings, and assists in consuming the escaping' products ofcombustion.

'In the annexed drawing- A. represents the hack or fire-plate,consisting principally ot' a sei-ies of bars, B B, Ste., placed inavertical position, and with their ends joined to and forming a partofthe upper and lower portions of said plate` Transversely, the bars aretriangular, with the base thereofat the trout, said base being in areabut ouethird ot' the sine, so that of the total areaot' sadbars, i

but one-fourth is exposed to the direct action ot' the fire, whilethe'remaining three-fourths is in immediate contact with the cold air,which is allowed to circulate freely in rear of the back-plate.

The contiguous edges ofthe to 'each other as it is possible to castthem, say,.one-

sixteenth of an inch, as the only object of the' vertical slot betweenthe barsis to permit'ot' their expansion and contraction laterally. v 7

The back-plate is placed at a. suitable distance in front 'ot' the frontoven-plate D, so as to leave between said plates an air-space, openingat tbe-bottominto the ash-pit, by means ot' which cold air is broughtinto contact with the rear of 'said back-plate,andetectually counteraetsthe e'ect' ofthe neatupon its front.

In order that the air thus introduced in rear ofthe back-plate may becontinually renewed, so as to be cool, and, at the same time, may assistin consuming the gas `arising from the burning coal, the V-shapedgrooves between the bars are extendedjupward, and

are `each connected with an annular opening, c, which' passes throughthe plate to-the front, near its upper edge.

ing- .current of heated gas at nearlya-rght angle, by which means saidair andgas are so thoroughly united as to insure the perfect combustionof the latter, and,

consequently, a large increase inthe amount ot' heat. i

` Having thus fully set forth the nature and; meritsy of my invention,

What- I claim as new, and desire to secure by Letters Patent, is

ing principally of the triangular bars B B, joined together at theirupper and lower ends,aud containing 'the annular-openings cc, near theupper edge thereof,

substantially as and for the purpose shown.

E. BOILEAU'. s

Witnesses Cuantas Mosman,

AJosera SIEGWAM.'

bars should be as close l -V Theair entering the space E from beneaththe grata; passesupward, and escapes through the openings c c, '&c.,into the fuel-chamber, where it 'meets the ascend- `z' Thewithin-described back or tire-plate A, consist-

